Improvement in ventilators for blow and dust rooms



J. B. HOLMES. 'Ventilators for Blow and Dust Rooms'.I

No. 206,949. Patented Aug. 13, 187s.

NPEFEIS, FHOTO-LITMOGRAPHER. WASHINGTONv D C.

WITNESSE'S: /f /Q 6 M UNITED STATES PATENT OEEIGE.

JOHN B. HOLMES, OF GRAYVILLE, ILLINOIS, ASSIGNOR TO HIMSELF AND ROSS MCOALL LANTERMAN, OF SAME PLACE.

IMPROVEMENT IN VENTILATORS FOR BLOW AND DUST ROOMS.

Specification forming part of Letters Patent No. 206,949, dated August 13, 1878; application ilcd March 22, 1878.

To all whom it may concern:

Beit known that I, J oEN BULL HOLMES, of Grayville, in the county of White and State of Illinois, have invented a new and Improved 4Ventilator and Oft'al- Grader for Blow and Dust Rooms, of which the following is a speciiication:

The ligure in the drawing is a vertical seciiou of my improved ventilator.

The objects of the invention are, lirst, to increase the grading capacity of the blow or dust room of a iiour-mill without changing its size; secondly, to save all the material worth saving, and at the same time to grade'it; and, thirdly, to direct the escaping dust downward and outside the mill, so that it may not fall on the roof and cause it to decay.

The blast laden with dust is introduced into the blow-room from the machine through a spout, A, in the usual way, and the blowrooms have heretofore been ventilated by a cupola rising above the roof and made with slotted sides, through which the air and the lightest particles of dust escaped. Another way of Ventilating has been to suspend muslin or other thin fabric around the sides of the blow-room, through which the air and the finest particles of dust escaped.

With my improvement I use the cupola in mills provided with them by tightly closing their top and sides, and placing in them a partition, 0,'extending nearly to their tops. One part of the double spout thus formed opens into the blow-room, and with the other part is connected a spout,D, leading into the dustroom, where the remaining ott'al settles, being very poor and light, and from which the air may be allowed to escape through a double spout similar to that hereinbet'ore described.

The air and dust may be carried through several rooms, through a series of double spouts, B C D, before the air is allowed to escape, the heavier particles settling upon the floor of each room as the blast becomes more and more deadened, so that the dust or oiial will be graded and the grades that are suitable can be reground.

The object is to cause the blast to pass up and then down to partially deaden it, so that the heavier particles carried by it may each time be allowed to settle upon the floor.

I am aware that a funnel has been used instead of a dust-room; but the latter is necessary to afford space for grading the oal and a proper expansion of the laden blast; hence my device is only used in connection with a blow-room, that is absolutely necessary in large mills wheremany purifiers are employed. My object is ventilation, the grading of the fall, and the saving of usually wasted material.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- The combination, with two or more blow and dust rooms in a flour-mill, of one or more cupolas, B, extending above the roof, tightly closed at top and sides, and provided with partitions C extending nearly to the top, one part of the double spout thus formed being connect-ed with blow-room and the other with a spout, D, leading downward to the dustroom, as and for the purpose specied.

JOHN BULL HOLMES.

Witnesses LESLIE DURLEY, FRANCIS M. LANTERMAN. 

